diff options
Diffstat (limited to 'sag-0.6.1-www/sag-0.6.1.html/x595.html')
| -rw-r--r-- | sag-0.6.1-www/sag-0.6.1.html/x595.html | 425 |
1 files changed, 425 insertions, 0 deletions
diff --git a/sag-0.6.1-www/sag-0.6.1.html/x595.html b/sag-0.6.1-www/sag-0.6.1.html/x595.html new file mode 100644 index 0000000..6a06c25 --- /dev/null +++ b/sag-0.6.1-www/sag-0.6.1.html/x595.html @@ -0,0 +1,425 @@ +<!DOCTYPE HTML PUBLIC "-//Norman Walsh//DTD DocBook HTML 1.0//EN"> +<HTML +><HEAD +><TITLE +>The /proc filesystem</TITLE +><META +NAME="GENERATOR" +CONTENT="Modular DocBook HTML Stylesheet"><LINK +REL="HOME" +TITLE="The Linux System Administrators' Guide" +HREF="book1.html"><LINK +REL="UP" +TITLE="Overview of the Directory Tree" +HREF="c212.html"><LINK +REL="PREVIOUS" +TITLE="The /var filesystem" +HREF="x531.html"><LINK +REL="NEXT" +TITLE="Using Disks and Other Storage Media" +HREF="c701.html"></HEAD +><BODY +BGCOLOR="#FFFFFF" +TEXT="#000000" +><DIV +CLASS="NAVHEADER" +><TABLE +WIDTH="100%" +BORDER="0" +CELLPADDING="0" +CELLSPACING="0" +><TR +><TH +COLSPAN="3" +ALIGN="center" +>The Linux System Administrators' Guide</TH +></TR +><TR +><TD +WIDTH="10%" +ALIGN="left" +VALIGN="bottom" +><A +HREF="x531.html" +>Prev</A +></TD +><TD +WIDTH="80%" +ALIGN="center" +VALIGN="bottom" +>Chapter 3. Overview of the Directory Tree</TD +><TD +WIDTH="10%" +ALIGN="right" +VALIGN="bottom" +><A +HREF="c701.html" +>Next</A +></TD +></TR +></TABLE +><HR +ALIGN="LEFT" +WIDTH="100%"></DIV +><DIV +CLASS="SECT1" +><H1 +CLASS="SECT1" +><A +NAME="AEN595" +>The <TT +CLASS="FILENAME" +>/proc</TT +> filesystem</A +></H1 +><P +>The <TT +CLASS="FILENAME" +>/proc</TT +> filesystem contains + a illusionary filesystem. It does not exist on a disk. + Instead, the kernel creates it in memory. It is used to provide + information about the system (originally about processes, hence + the name). Some of the more important files and directories are + explained below. The <TT +CLASS="FILENAME" +>/proc</TT +> filesystem is + described in more detail in the <TT +CLASS="FILENAME" +>proc</TT +> manual page. + + <DIV +CLASS="GLOSSLIST" +><DL +><DT +><B +><TT +CLASS="FILENAME" +>/proc/1</TT +></B +></DT +><DD +><P +>A directory with information about + process number 1. Each process has a directory below + <TT +CLASS="FILENAME" +>/proc</TT +> with the name being its process + identification number. </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/cpuinfo</TT +></B +></DT +><DD +><P +>Information about the processor, + such as its type, make, model, and perfomance. + </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/devices</TT +></B +></DT +><DD +><P +>List of device drivers configured into the + currently running kernel. </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/dma</TT +></B +></DT +><DD +><P +>Shows which DMA channels are being used + at the moment. </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/filesystems</TT +></B +></DT +><DD +><P +>Filesystems configured into the kernel. + </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/interrupts</TT +></B +></DT +><DD +><P +>Shows which interrupts are + in use, and how many of each there have been. + </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/ioports</TT +></B +></DT +><DD +><P +>Which I/O ports are in use at the moment. + </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/kcore</TT +></B +></DT +><DD +><P +>An image of the physical memory of + the system. This is exactly the same size as your + physical memory, but does not really take up that much + memory; it is generated on the fly as programs access it. + (Remember: unless you copy it elsewhere, nothing under + <TT +CLASS="FILENAME" +>/proc</TT +> takes up any disk space + at all.) </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/kmsg</TT +></B +></DT +><DD +><P +>Messages output by the kernel. + These are also routed to <B +CLASS="COMMAND" +>syslog</B +>. + </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/ksyms</TT +></B +></DT +><DD +><P +>Symbol table for the kernel. + </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/loadavg</TT +></B +></DT +><DD +><P +>The `load average' of the system; three + meaningless indicators of how much work the system has + to do at the moment. </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/meminfo</TT +></B +></DT +><DD +><P +>Information about memory usage, both + physical and swap. </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/modules</TT +></B +></DT +><DD +><P +>Which kernel modules are loaded at + the moment. </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/net</TT +></B +></DT +><DD +><P +>Status information about network + protocols. </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/self</TT +></B +></DT +><DD +><P +>A symbolic link to the process + directory of the program that is looking at + <TT +CLASS="FILENAME" +>/proc</TT +>. When two processes look at + <TT +CLASS="FILENAME" +>/proc</TT +>, they get different links. + This is mainly a convenience to make it easier + for programs to get at their process directory. + </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/stat</TT +></B +></DT +><DD +><P +>Various statistics about the system, such + as the number of page faults since the system was booted. + </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/uptime</TT +></B +></DT +><DD +><P +>The time the system has been up. + </P +></DD +><DT +><B +><TT +CLASS="FILENAME" +>/proc/version</TT +></B +></DT +><DD +><P +>The kernel version. + </P +></DD +></DL +></DIV +></P +><P +>Note that while the above files tend to be easily + readable text files, they can sometimes be formatted in a way + that is not easily digestable. There are many commands that + do little more than read the above files and format them for + easier understanding. For example, the <B +CLASS="COMMAND" +>free</B +> + program reads <TT +CLASS="FILENAME" +>/proc/meminfo</TT +> and converts + the amounts given in bytes to kilobytes (and adds a little more + information, as well).</P +></DIV +><DIV +CLASS="NAVFOOTER" +><HR +ALIGN="LEFT" +WIDTH="100%"><TABLE +WIDTH="100%" +BORDER="0" +CELLPADDING="0" +CELLSPACING="0" +><TR +><TD +WIDTH="33%" +ALIGN="left" +VALIGN="top" +><A +HREF="x531.html" +>Prev</A +></TD +><TD +WIDTH="34%" +ALIGN="center" +VALIGN="top" +><A +HREF="book1.html" +>Home</A +></TD +><TD +WIDTH="33%" +ALIGN="right" +VALIGN="top" +><A +HREF="c701.html" +>Next</A +></TD +></TR +><TR +><TD +WIDTH="33%" +ALIGN="left" +VALIGN="top" +>The <TT +CLASS="FILENAME" +>/var</TT +> filesystem</TD +><TD +WIDTH="34%" +ALIGN="center" +VALIGN="top" +><A +HREF="c212.html" +>Up</A +></TD +><TD +WIDTH="33%" +ALIGN="right" +VALIGN="top" +>Using Disks and Other Storage Media</TD +></TR +></TABLE +></DIV +></BODY +></HTML +>
\ No newline at end of file |